U.S. patent application number 10/549527 was filed with the patent office on 2006-07-20 for anti-seismic reinforcement and expansion mehtod for building and anti-seismically reinforced and expanded building.
Invention is credited to Yoriko Ikawa, Shigeru Kayasuga, Yaeko Kida, Itsuo Kishimoto, Norifumi Kokawa, Ryuji Kokawa, Masao Komori, Jyunya Sakai, Koutarou Shinjyou, Shouzou Takigawa, Minoru Terada, Hiroshi Tsunobe, Yutaka Uego, Yasumasa Yamamoto, Masashi Yamashita.
Application Number | 20060156647 10/549527 |
Document ID | / |
Family ID | 33027991 |
Filed Date | 2006-07-20 |
United States Patent
Application |
20060156647 |
Kind Code |
A1 |
Kokawa; Norifumi ; et
al. |
July 20, 2006 |
Anti-seismic reinforcement and expansion mehtod for building and
anti-seismically reinforced and expanded building
Abstract
A method of expanding a mid-rise building to a high-rise
building, where a quake-absorbing foundation (5) for a high-rise
building is newly provided outside the foundation of an existing
mid-rise building (19) support members (6) are stood on the newly
provided quake-absorbing foundation, and new dwelling floors (10)
are fabricated above the existing building using the support
members. After the completion of the new dwelling floors, upper
floors of the existing mid-rise building are dismantled and removed
and remaining individual floors of the building are remodeled
sequentially Thus, with the dwellers living in the building, a
mid-rise building can be expanded to a high-rise building having
excellent quake-resistance.
Inventors: |
Kokawa; Norifumi;
(Suita-Shi, JP) ; Kishimoto; Itsuo; (Kashiba-Shi,
JP) ; Uego; Yutaka; (Sennan-Gun, JP) ;
Yamamoto; Yasumasa; (Osaka-Shi, JP) ; Sakai;
Jyunya; (Osaka-Shi, JP) ; Komori; Masao;
(Osaka-Shi, JP) ; Takigawa; Shouzou; (Osaka-Shi,
JP) ; Kayasuga; Shigeru; (Takarazuka-Shi, JP)
; Ikawa; Yoriko; (Suita-Shi, JP) ; Kida;
Yaeko; (Tondabayashi-Shi, JP) ; Shinjyou;
Koutarou; (Higashiosaka-Shi, JP) ; Tsunobe;
Hiroshi; (Jobo-Gun, JP) ; Terada; Minoru;
(Osaka-Shi, JP) ; Yamashita; Masashi;
(Shinagawa-Ku, JP) ; Kokawa; Ryuji;
(Yamatokoriyama-Shi, JP) |
Correspondence
Address: |
AKC PATENTS
215 GROVE ST.
NEWTON
MA
02466
US
|
Family ID: |
33027991 |
Appl. No.: |
10/549527 |
Filed: |
May 2, 2003 |
PCT Filed: |
May 2, 2003 |
PCT NO: |
PCT/JP03/05641 |
371 Date: |
January 25, 2006 |
Current U.S.
Class: |
52/167.1 |
Current CPC
Class: |
E04G 23/0266 20130101;
E04G 23/0218 20130101 |
Class at
Publication: |
052/167.1 |
International
Class: |
E04H 9/02 20060101
E04H009/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 20, 2003 |
JP |
2003-78956 |
Claims
1. An anti-seismic reinforcement and expansion method for expanding
and remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for the high-rise building on the
outer side of existing foundations of the mid-rise building (1),
providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building with utilizing said support members, and after
said new dwelling stories are formed, remodeling each story of the
above-ground part of the existing mid-rise building with
reinforcing existing pile foundations (9).
2. An anti-seismic reinforcement and expansion method according to
claim 1 for expanding and remodeling an existing mid-rise building
(1) into a high-rise building wherein said step of reinforcing
existing pile foundations is performed by digging around said
existing pile foundations and filling concrete (18) around footings
(9a) so as to increase the cross sectional area of the
footings.
3. An anti-seismic reinforcement and expansion method for expanding
and remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for the high-rise building on the
outer side of existing foundations of the mid-rise building (1),
providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building with utilizing said support members, after said
new dwelling stories are formed, dismantling and removing the
above-ground part of said existing mid-rise building to form a
space, laying beams (16) between said support members in said space
to form floors for a second story and stories above the second
story, providing a floor for a first story on the upper portion of
existing pile foundations (9), and providing new dwelling spaces on
said floors of said each new story.
4. An anti-seismic reinforcement and expansion method for expanding
and remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for a high-rise building on the
outer side of existing foundations of the mid-rise building (1),
providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building with utilizing said support members, after said
new dwelling stories are formed, dismantling and removing the upper
stories of said existing mid-rise building, and remodeling
remaining stories of said existing mid-rise building story by
story.
5. A building anti-seismically reinforced and expanded by the steps
of, providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundations, and forming new dwelling stories
(10) above the existing building with utilizing said support
members, wherein in said existing mid-rise building, each
above-ground stories are remodeled sequentially and existing pile
foundations (9) are reinforced.
6. A building anti-seismically reinforced and expanded by the steps
of, providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundations, and forming new dwelling stories
(10) above the existing building with utilizing said support
members, wherein floors for the second story and stories above the
second story are formed by laying beams between said support
members in a space created by dismantling and removing the
above-ground part of said existing mid-rise building, wherein a
floor for the first story is provided at the upper portion of said
existing pile foundations (9), and wherein new dwelling space is
formed on the floors of each of the newly formed stories.
7. A building anti-seismically reinforced and expanded by the steps
of, providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundation, and forming new dwelling stories (10)
above the existing building with utilizing said support members,
wherein upper stories of said existing mid-rise building is
dismantled and removed, and wherein each of remaining stories are
remodeled.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Technical Field
[0002] The present invention relates to an anti-seismic
reinforcement and expansion method for building and an
anti-seismically reinforced and expanded building. Particularly the
present invention relates to an anti-seismic reinforcement and
expansion method for building and an anti-seismically reinforced
and expanded building where a mid-rise building such as mid-rise
staircase type apartment house is expanded and remodeled into a
high-rise building with excellent quake-resistance.
[0003] 2. Description of the Related Art
[0004] In Japan, in 1960s and 1970s, many mid-rise apartment houses
were built to meet the increasing demand for housing due to a rapid
population growth in suburban areas.
[0005] Most of these apartment houses are so-called staircase type
apartment houses. These houses have outdoor staircases connecting
to the doorways of dwelling units facing each other.
[0006] The dwellers in such staircase type apartment houses are
generally ageing. These aged dwellers, especially those residing in
upper stories, have trouble in going up and down the stairs.
Therefore there is a need for remodeling such apartment houses into
barrier-free houses that are more comfortable for elderly
people.
[0007] However, such remodeling causes a lot of problems, for
example, vast amount of demolition debris and construction cost. In
addition, the dwellers of the apartment houses usually need to move
to a temporary address while the apartment houses are
remodeled.
[0008] In consideration to the above, there is a proposed method
for remodeling an existing staircase type apartment house into a
balcony type apartment house with passages extending along one side
of the building. (See Japan Patent Publication TOKUKAI
H11-159153).
[0009] The art disclosed therein advantageously enables remodeling
of an existing staircase type apartment house into a balcony type
apartment house having newly equipped elevators with the dwellers
remaining in the house.
[0010] However, this conventional method is not intended to improve
quake-resistance. On the other hand, staircase type apartment
houses typically have a problem in quake-resistance because these
houses were built according to the former Japan national standard
for quake-resistance of buildings.
[0011] Moreover, it is sometimes desired to increase the dwelling
space (the number of dwelling units) in the apartment house upon
remodeling the house. However this method cannot satisfy such
need.
[0012] Accordingly, the object of the present invention is to
provide an anti-seismic reinforcement and expansion method for a
building that enables remodeling mid-rise buildings, such as
staircase type apartment houses, into high-rise buildings that meet
the current national standard for quake-resistance of buildings and
the buildings remodeled according to the method. This method also
allows dwellers to keep living in the house while the apartment
house is remodeled.
SUMMARY OF THE INVENTION
[0013] The present invention according to claim 1 provides an
anti-seismic reinforcement and expansion method for expanding and
remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for the high-rise building on the
outer side of existing foundations of the mid-rise building (1),
providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building utilizing said support members, and after said
new dwelling stories are formed, dismantling and removing each
story of the above-ground part of the existing mid-rise building
with reinforcing existing pile foundations (9).
[0014] The present invention according to claim 2 provides an
anti-seismic reinforcement and expansion method for expanding and
remodeling an existing mid-rise building (1) into a high-rise
building wherein said step of reinforcing existing pile foundations
is performed by digging around said existing pile foundations and
filling concrete (18) around footings (9a) so as to increase the
cross sectional area of the footings.
[0015] The present invention according to claim 3 provides an
anti-seismic reinforcement and expansion method for expanding and
remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for the high-rise building on the
outer side of the existing foundations of the mid-rise building
(1), providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building with utilizing said support members, after said
new dwelling stories are formed, dismantling and removing the
above-ground part of said existing mid-rise building to form a
space, laying beams (16) in said space to form floors for a second
story and stories above the second story are constructed, providing
a floor for a first story on the upper portion of existing pile
foundations (9), and providing new dwelling spaces on said floors
of said each new story.
[0016] The present invention according to claim 4 provides an
anti-seismic reinforcement and expansion method for expanding and
remodeling an existing mid-rise building (1) into a high-rise
building and the method comprising the steps of, providing new
seismic isolation foundations (5) for a high-rise building on the
outer side of existing foundations of the mid-rise building (1),
providing support members (6) on said newly provided seismic
isolation foundations, forming new dwelling stories (10) above the
existing building with utilizing said support members, after said
new dwelling stories are formed, dismantling and removing the upper
stories of said existing mid-rise building, and remodeling
remaining stories of said existing mid-rise building story by
story.
[0017] The present invention according to claim 5 provides a
building anti-seismically reinforced and expanded by the steps of,
providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundations, and forming new dwelling floors (10)
above the existing building with utilizing said support members,
wherein in said existing mid-rise building, each above-ground
stories are remodeled sequentially and existing pile foundations
(9) are reinforced.
[0018] The present invention according to claim 6 provides a
building anti-seismically reinforced and expanded by the steps of,
providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundations, and forming new dwelling stories
(10) above the existing building with utilizing said support
members, wherein the second story and stories above the second
story are formed by laying beams between said support members in
the space created by dismantling and removing the above-ground part
of said existing mid-rise building, wherein the first story is
provided above existing pile foundations (9), and wherein new
dwelling space is formed on the floors of each of the newly formed
stories.
[0019] The present invention according to claim 7 provides a
building anti-seismically reinforced and expanded by the steps of,
providing seismic isolation foundations (5) for a high-rise
building on the outer side of the foundations of an existing
mid-rise building (1), providing support members (6) on said
seismic isolation foundations, and forming new dwelling stories
(10) above the existing building with utilizing said support
members, wherein upper stories of said existing mid-rise building
are dismantled and removed and wherein each of remaining stories is
remodeled.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a schematic view of the longitudinal section of
the building remodeled according to the first step of the first
embodiment of the anti-seismic reinforcement and expansion method
for buildings of the present invention.
[0021] FIG. 2 is a schematic view of the longitudinal section of
the building remodeled according to the second step of the first
embodiment of the anti-seismic reinforcement and expansion method
for buildings of the present invention.
[0022] FIG. 3 is a schematic view of the longitudinal section of
the building remodeled according to the third step of the first
embodiment of the anti-seismic reinforcement and expansion method
for buildings of the present invention.
[0023] FIG. 4 is a schematic view of the longitudinal section of
the building remodeled according to the forth step of the first
embodiment of the anti-seismic reinforcement and expansion method
for buildings of the present invention.
[0024] FIG. 5 is a schematic view of the longitudinal section of
the building remodeled according to the fifth step of the first
embodiment of the anti-seismic reinforcement and expansion method
for buildings of the present invention.
[0025] FIG. 6 is a schematic view of the longitudinal section of
the building where existing piles are reinforced according to the
first embodiment of the present invention.
[0026] FIG. 7 is a top view of the building before remodeling
according to the method of the present invention.
[0027] FIG. 8 is a top view of the building in the midterm stage of
the anti-seismic and reinforcement method for buildings according
to the present invention.
[0028] FIG. 9 is a top view of the mid-rise building after it is
remodeled.
[0029] FIG. 10 is a schematic view of the longitudinal section of
the building in the first stage of the second embodiment of the
anti-seismic reinforcement and expansion method for buildings of
the present invention.
[0030] FIG. 11 is a schematic view of the longitudinal section of
the building in the second stage of the second embodiment of the
anti-seismic reinforcement and expansion method for buildings of
the present invention.
[0031] FIG. 12 is a schematic view of the longitudinal section of
the building in the third stage of the second embodiment of the
anti-seismic reinforcement and expansion method for buildings of
the present invention.
[0032] FIG. 13 is a schematic view of the longitudinal section of
the building in the first stage of the third embodiment of the
anti-seismic reinforcement and expansion method for buildings of
the present invention.
[0033] FIG. 14 is a schematic view of the longitudinal section of
the building in the second stage of the third embodiment of the
anti-seismic reinforcement and expansion method for buildings of
the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0034] Hereinafter, preferred embodiments of the anti-seismic
reinforcement and expansion method for buildings according to the
present invention will be described with reference to the
drawings.
[0035] The present invention relates to the method for expanding a
mid-rise building with three to five stories to a high-rise
building with six or more stories. The mid-rise building was
constructed according to the former national standard for
quake-resistance of buildings before the current law regarding
quake-resistance design became effective. The high-rise building
will meet the current national standard for quake-resistance of
buildings which has higher requirement on quake-resistance than the
former one. The present invention relates also to a high-rise
building constructed using the method of the present invention.
[0036] Hereinafter, the present invention will be explained taking
staircase type apartment houses as an example of mid-rise
buildings. The present invention is preferably implemented in a
staircase type apartment house, though not limited to this.
[0037] FIGS. 1 to 5 is a series of schematic views that shows in
sequence the processes of the first embodiment of quake-resistance
reinforcement and expansion method according to the present
invention.
[0038] FIG. 7 shows the building before the method according to the
present invention is carried out. Note that FIG. 7 is a top view of
the first story (the story at the ground level).
[0039] These drawings show the example of a mid-rise building with
five stories and a high-rise building with eleven stories. However,
the number of stories in the mid-rise building or in the high-rise
building is not limited to these.
[0040] FIG. 1 and FIG. 7 are views of the mid-rise building (1)
shown before being remodeled according to the method of the present
invention. The mid-rise building (1) is a staircase type apartment
house with outdoor staircases (4) leading to doorways (3) of each
dwelling unit (2).
[0041] In the first step of the method according to the present
invention, seismic isolation foundations (5) for the high-rise
building are placed outside the foundations of the existing
mid-rise building so that the a series of the new foundations
surround the existing mid-rise building (See FIG. 8).
[0042] In all the embodiments of the present invention, seismic
isolation foundations (5) used for supporting support members (6)
can have any known seismic isolation structure. Such seismic
isolation foundation (5) can be, for example, a multilayer support
which consists of a pair of metal plates disposed on the top and
the bottom of the foundation for connection and a lamination
support so called as "isolator" disposed between the metal plates.
In the lamination support, rubber sheet layers and metal sheet
layers are alternatingly laminated. Furthermore viscous fluid can
be occluded inside the lamination support for obtaining damping
effect resulting from the transformation of the fluid.
[0043] In order to form new dwelling stories (10), first the
support members (6) which work as pillars of the high-rise building
are upwardly extending from the top of the seismic isolation
foundations (5). Then beams (7) are laid between support members
(6) above the existing mid-rise building (1) (See FIG. 2). After
that, by setting a roof and floors over the beams, new dwelling
stories (10) are formed above the existing mid-rise building (1)
(See FIG. 3).
[0044] In the embodiment illustrated by the drawings, the newly
formed dwelling stories (10) consists of the sixth story utilized
as a shared space (10b) which all dwellers can use and seventh to
eleventh stories utilized as dwelling spaces. However, in the
present invention, all the floors that are newly formed may be used
as dwelling spaces.
[0045] After new dwelling stories (10) are formed in such manner,
dwellers in the existing mid-rise building (1) move to the newly
formed floors (10). Then the existing mid-rise building (1) is
remodeled story by story from top to bottom (See FIG. 4).
[0046] The lowest story (10b) of the newly formed stories is not
used for dwelling purpose, as described above. In this case, this
story (10b) prevents the noise caused by the construction in the
existing mid-rise building from being transmitted to the newly
formed upper stories in which the dwellers moved from the existing
building live. The story (10b) may be utilized as a yard for
building materials or a field office in order to improve the
efficiency of the construction.
[0047] By forming new dwelling stories, the dwellers can
continuously stay in the building (1) during expansion of the
existing mid-rise building (1). In other words, the dwellers need
not to move outside the building (1) during the construction.
[0048] Therefore, in the present invention, the number of newly
formed dwelling stories (10) is preferably larger than the number
of stories in the existing mid-rise building (1) so that all the
dwellers can move to the newly formed stories.
[0049] Each above-ground story of the existing mid-rise building
(1) is remodeled by dismantling and removing the outdoor staircases
(4) and replacing with new floors (8) extending from the existing
floors.
[0050] FIG. 9 is a plan view showing the mid-rise building after
being remodeled. The existing mid-rise building is remodeled so
that the floors are extended in the horizontal direction. After
remodeling the existing mid-rise building, in each story of the
remodeled existing mid-rise building, a U-shaped aisle (11) is
disposed. The U-shaped aisles (11) transversely extends in front of
a series of the dwelling units (2) in the story and extends to the
outer side of the dwelling units located at both ends of the series
of the dwelling units (2). In addition, elevators (12) and
emergency stairs (13) are installed on the side of the aisles (11)
opposite the dwelling units.
[0051] Each entrance (14) for every dwelling unit faces the newly
formed aisle (11) so that the dwellers in every dwelling unit can
directly access the aisle (11). All the entrances (14) are placed
beside the place where the outdoor staircases (4) were originally
placed.
[0052] Such direct path to the aisle (11) serves as an independent
escape route for the dwellers in the series of the dwelling units
(2) in case of a fire or an earthquake. Furthermore, the dwellers
can come in and out their dwelling unit (2) with maintaining their
privacy.
[0053] Expansion joints are placed between the newly formed aisle
(11) and the dwelling units (2) and between the existing dwelling
units (2) and the newly extended floor (8). The newly formed aisle
(11) and the dwelling units (2) are connected with just the
expansion unit. This prevents footsteps in the aisles from being
transmitted directly to the inside of the rooms. Also the existing
dwelling units (2) and the newly extended floor (8) are connected
with just the expansion unit. This prevents the vibration of the
newly formed part of the house from being transmitted to the
existing dwelling space in case of an earthquake. Expansion joints
are used in the positions designated by dotted circles in FIG.
9.
[0054] The method according to the first embodiment of the present
invention features that the existing pile foundations (9)
supporting the mid-rise building are reinforced before the
above-ground part of the mid-rise building is remodeled according
to the above-mentioned method.
[0055] During this reinforcement, the existing pile foundations (9)
are still embedded in the ground without being pulled out. Also,
there is no need to construct new pile foundations. The existing
pile foundations (9) are reinforced by digging around and under the
existing pile foundations (9) and by filling concrete (18) around
and under the footings (9a).
[0056] Thus the cross section of the footings (9a) is increased. As
a result, the footing (9a) can support higher load and this
improves the quake-resistance of the expanded house, especially the
part where the mid-rise building (1) originally stood.
[0057] In the high-rise building constructed in this way, extended
part surrounding the existing mid-rise building (1) is supported by
the seismic isolation foundations (5) and the existing mid-rise
building (1) by the reinforced foundations (9). Therefore the
expanded building becomes a high-rise building with six or more
stories that meets new quake-resistance standard, although the
building is expanded from a mid-rise building designed according to
the former standard.
[0058] FIGS. 10-12 are schematic views of the longitudinal section
of the building expanded and reinforced according to the second
embodiment of the present invention showing in each phase of the
construction.
[0059] The method according to the second embodiment follows the
same initial several processes as the processes of the first
embodiment described above. More specifically, the method of the
second embodiment also consists of the processes of placing seismic
isolation foundations for the high-rise building on the outer side
of the foundations of the existing mid-rise building, providing
support members on the newly formed seismic isolation foundations,
and then forming new dwelling stories above the existing building
with utilizing the support members.
[0060] Accordingly, the explanation and the drawings relating to
these processes common to the first and the second methods will be
omitted and only subsequent different processes from the first
embodiment will be explained hereinafter.
[0061] Referring to FIG. 3, after the new dwelling stories (10) are
formed above the existing mid-rise building (1), the above-ground
part of the existing mid-rise building (1) is dismantled and
removed entirely (FIG. 10).
[0062] Around the space generated by dismantling and removing the
existing mid-rise building (1), there are support members (6)
provided on the seismic isolation foundations (5). Beams (16) are
laid on and supported by these support members (6) (See FIG.
11).
[0063] Then floor members are placed on the beams (16) to form
floors for the second story and stories above the second story.
Floors for the first story are formed on the concrete that was cast
on the existing pile foundations (9). After forming the floors,
dwelling spaces (15) are formed in each story to obtain a high-rise
building as shown in FIG. 12.
[0064] Such structure allows the newly formed seismic isolation
foundations (5) to support the weight load of the second story and
the stories above the second story. This decreases the weight
loaded on the foundations (9) of the existing mid-rise building
(1). Thus, the high-rise building expanded according to the method
of the second embodiment meets the new national standard for
quake-resistance without reinforcing the existing foundations (9)
even though the existing mid-rise building (1) was built according
to the former standard.
[0065] FIGS. 13 and 14 are schematic views of the longitudinal
section of the building expanded and reinforced according to the
method of the third embodiment of the present invention in each
process of the construction.
[0066] The method of the third embodiment also follows the same
initial several steps as the processes of the first embodiment
described above. More specifically, the method of the third
embodiment also consists of the processes of placing seismic
isolation foundations for the high-rise building outside the
foundations of the existing mid-rise building, providing support
members on the newly formed seismic isolation foundations, and then
forming new dwelling stories above the existing building with
utilizing the support members.
[0067] Accordingly, the explanation and the drawings relating to
these processes common to the first and the second methods will be
omitted and only subsequent different processes from the first and
the second embodiments will be explained hereinafter.
[0068] Referring to FIG. 3, after new dwelling stories (10) are
formed above the existing mid-rise building (1), the dwellers in
the mid-rise building (1) move to the newly formed dwelling stories
(10). Then upper stories of the existing mid-rise building (1) are
dismantled and removed (See FIG. 13). The number of the stories
dismantled and removed in this process is typically one to three,
though not limited to these. In the example shown in the drawings,
two stories (the forth story and the fifth story) are dismantled
and removed.
[0069] By dismantling and removing the upper stories of the
existing mid-rise building (1), the weight load on the existing
foundation (9) that support the mid-rise building (1) is reduced
and the quake-resistance of the high-rise building is improved.
[0070] Then the remaining stories (the first to third stories in
the example shown in the drawings) of the existing mid-rise
building (1) are remodeled and dwelling spaces are formed in each
story. Then the construction processes are completed (See FIG.
14).
[0071] Each story of the existing mid-rise building is remodeled in
basically the same manner as the method of the first embodiment
described above in line 6-26 of page 7. More specifically, this
remodeling consists of the steps of dismantling and removing the
outdoor staircases (4) and forming new floors extending from the
existing floors to the space generated by the dismantling and the
removing.
[0072] In the high-rise building constructed in this way, the
extended part surrounding the existing mid-rise building (1) is
supported by the seismic isolation foundations (5). On the other
hand, the weight loaded on the foundations (9) that support the
existing mid-rise building is reduced as the upper stories are
removed. Therefore the expanded building, as a whole, becomes a
high-rise building with six or more stories that meets new
quake-resistance standard, although the building was originally a
mid-rise building designed according to the former standard.
[0073] As illustrated in FIG. 14, the high-rise building
constructed with the method of the third embodiment has a
multi-story hall (17) in the space formerly occupied by the removed
stories (the forth and the fifth story in the example shown in the
drawings) of the mid-rise building.
[0074] According to the anti-seismic reinforcement and expansion
method for building and anti-seismically reinforced and expanded
building of the present invention, it is possible not only to
expand and remodel a mid-rise building such as staircase type
apartment house into a high-rise building with the dwellers
remaining in the building but also to remodel the existing building
designed according to the former standard into a high-rise building
that reach the new national standard for quake-resistance.
* * * * *